Discoloured uPVC frames, sills and cladding
White uPVC shows everything. Green film on the shaded side, grey traffic film on a road-facing elevation, and dark run-off lines under fixings are the three that get noticed.
Ask us about this
Monday to Saturday, 8am – 7pm
- Test whether it is film or oxidisation before expecting a full recovery
- Sills and drip edges hold the worst staining
- Do frames and glass in the same visit
Film versus oxidisation
Most discolouration is a film that will come off with the right detergent and dwell time. Chalky, faded plastic that stays dull after cleaning is oxidised, and no amount of washing brings that back, because the surface itself has degraded.
Sills catch the worst of it
Sills collect run-off from the glass above and hold it at the drip edge. That is where staining concentrates, and it is why sills often look far worse than the frames they sit under.
Doing it with the glass
Frames, sills and glass are one job rather than three. Cleaning the glass and leaving the frames leaves dirty water marks back onto clean glass at the next rain.
Common questions
- Can faded uPVC be restored?
- Cleaning removes film. Genuine oxidisation is a surface change and cleaning will not reverse it.
- Do you clean fascias and soffits?
- Yes, usually alongside gutter work since it is the same access.
- Will detergents mark the plastic?
- Not the ones suited to uPVC. Abrasive scrubbing is what marks it.
Similar situations
Send a photo of a sill and a frame and we will tell you honestly how much of it will come back.
Get a written quote